Alexandrite is a rare gemstone and is the birthstone for the month of June shared with the Pearl. It is also the accepted stone for the 55th anniversary. Alexandrite is a valuable stone that has color changing properties and has a green or blue-green color is some lights but can change to red or red-purple colors in other lights. Other shades or brown, oranges and yellows can be picked up in certain lights as well. This is a very cool gem because it is the only one that always will have a color change! The more red the gem has in incandescent light, is the more valuable it is.